CN108061847A - Dry-type reactor epoxy resin insulating medium cracking detection method - Google Patents
Dry-type reactor epoxy resin insulating medium cracking detection method Download PDFInfo
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- CN108061847A CN108061847A CN201711410191.9A CN201711410191A CN108061847A CN 108061847 A CN108061847 A CN 108061847A CN 201711410191 A CN201711410191 A CN 201711410191A CN 108061847 A CN108061847 A CN 108061847A
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 53
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 53
- 238000005336 cracking Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims description 53
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims description 39
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000013178 mathematical model Methods 0.000 claims description 3
- 230000000803 paradoxical effect Effects 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 241001062009 Indigofera Species 0.000 description 2
- 240000005572 Syzygium cordatum Species 0.000 description 2
- 235000006650 Syzygium cordatum Nutrition 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 241000219000 Populus Species 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 238000000825 ultraviolet detection Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a dry-type reactor epoxy resin insulating medium cracking detection method, which is an on-line detection method and comprises two steps of establishing an image threshold information database and detecting the cracking of the dry-type reactor epoxy resin insulating medium: a. establishing an image threshold information database, and converting the collected discharge threshold source data information and the collected temperature threshold source data information into discharge image threshold data information and temperature image threshold data information; b. the method for detecting the cracking of the epoxy resin insulating medium of the dry-type reactor comprises the following steps: sampling image information; and judging that the epoxy resin insulating medium of the dry-type reactor is not cracked if the outline overlapping part is not compared with the discharge image information and the high-temperature image information. The invention has high test efficiency and strong reliability, is suitable for engineering detection and scientific research, and has higher application value.
Description
Technical field
The present invention relates to epoxy resins insulation medium cracking detection technique fields.
Background technology
The polymeric types such as epoxy resin high-molecular organic material is since with good electrical insulation properties, plasticity is good, side
Just the features such as processing progressively instead of natural insulation medium, becomes important electrical insulating material.Epoxy resin extensively should
It is especially mutual in electric current for the cast of the insulating elements such as motor, electric appliance, electronic subassembly and kilovolt high voltage power transmission transformer
It is widely applied in sensor, voltage transformer, dry-type transformer, GIS, cable coupling box.
With the continuous increase of electrical grid transmission capacity, voltage class is stepped up, to the peace of various power equipments operation
Full property and reliability requirement are higher and higher, and dry reactor is also widely applied in electric system.But in During Process of Long-term Operation,
Especially under severe weather conditions, insulation cracking easily occurs for dry reactor insulating materials, generates substantial amounts of water tree, water tree is most
Electric tree is converted into eventually, and then induces dielectric breakdown accident, seriously affects power system security reliability service.
Some researches show that insulation cracking is the main reason for poplar bundles is caused to discharge and then induce dielectric breakdown accident.
Therefore, in order to reduce or even avoid dry reactor to generate breakdown accident during operation, it is necessary to carry out cracking inspection to it, into
And it just eliminates safe hidden trouble at cracking initial stage.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of dry reactor epoxy resins insulation medium cracking detection sides
Method, it has the characteristics that easy to operation, Detection accuracy is high.
In order to solve the above technical problems, the technical solution used in the present invention is：
A kind of dry reactor epoxy resins insulation medium cracking detection method, this method is online test method, bag
It includes and establishes image threshold information database and dry reactor epoxy resins insulation medium cracking two big steps of detection：
A, establish image threshold information database, image threshold information database include electric discharge image threshold data message and
The adquisitiones of temperature pattern threshold data information, electric discharge image threshold data message and temperature pattern threshold data information includes
Following steps：
A), by ultraviolet imager and infrared thermoviewer respectively under different humitures and luminous intensity to the asphalt mixtures modified by epoxy resin of cracking
Fat dielectric carries out Image Acquisition, obtains the ultraviolet image and infrared image under different humitures and luminous intensity；
B), to epoxy resins insulation medium cracking position pixel corresponding in the ultraviolet image and infrared image that are gathered
Extract, the pixel extracted in ultraviolet image be discharge threshold source data information, the picture extracted in infrared image
Element is temperature threshold source data information；
C), to the discharge threshold source data information and temperature threshold source data information that are gathered respectively by formula Y=
0.299R+0.587G+0.114B is converted into gray level image information；
In formula：Y is the gray value of image slices vegetarian refreshments, and R is red pixel component value, and G is green pixel component value, and B is
Blue pixel component value；
Y scopes are 0~255, and the gray value of complete white vegetarian refreshments is " 255 ", and the gray value of completely black pixel is " 0 "；
The gray level image information that discharge threshold source data information is converted into forms electric discharge image threshold data message, temperature threshold
The gray level image information that value source data information is converted into forms temperature pattern threshold data information；
B, dry reactor epoxy resins insulation medium cracking detection, comprises the following steps：
A), image information samples, by ultraviolet imager and infrared thermoviewer to epoxy resins insulation medium to be detected
The shooting of multi-angle is carried out respectively, is gathered ultraviolet image data message and infrared picture data information, and is recorded acquisition figure simultaneously
Humiture and luminous intensity during as data message；
B), to the ultraviolet image data message and infrared picture data information that are gathered respectively by formula Y=0.299R+
0.587G+0.114B is converted into greyscale image data information；
In formula：Y is the gray value of image slices vegetarian refreshments, and R is red pixel component value, and G is green pixel component value, and B is indigo plant
Colour component values；
The gray level image that ultraviolet image data message is converted into forms strength of discharge image information to be checked, infrared picture data
The gray level image that information is converted into forms heating intensity image information to be checked；
C), to the strength of discharge gathered image information to be checked humiture identical with image threshold database and luminous intensity
Corresponding electric discharge image threshold data message is compared, and is extracted in strength of discharge image information to be checked higher than electric discharge image
Threshold data message part shown profile in the picture, forms electric discharge image information, if strength of discharge image letter to be checked
Breath does not extract electric discharge image information, then judging result is the non-paradoxical discharge of dry reactor epoxy resins insulation medium；
D), the heating intensity image information to be checked humiture identical with image threshold database and luminous intensity to being gathered
Corresponding temperature pattern threshold data information is compared, and is extracted in heating intensity image information to be checked higher than temperature pattern
Threshold data message part shown profile in the picture, forms high temperature image information, if heating intensity image letter to be checked
High temperature image information is not extracted in breath, then judging result is the non-mid-winter of dry reactor epoxy resins insulation medium；
E), the detection of epoxy resin cracking judges, electric discharge image information and high temperature image information is compared, in image
In contour convergence part can be judged as dry reactor epoxy resins insulation medium crack location, if electric discharge image information
Not contrasting contour convergence part with high temperature image information can be judged as that dry reactor epoxy resins insulation medium does not crack.
The present invention further improvement lies in that：
In stepb, epoxy resins insulation medium to be detected is carried out by ultraviolet imager and infrared thermoviewer more
The shooting of angle, to carry out circumferential multi-angled shooting to epoxy resins insulation medium to be detected.
In stepb, denoising is carried out by Threshold Segmentation Algorithm to electric discharge image information, it is each to electric discharge image information
Pixel assigns Y=255 or Y=0, and mathematical model is：
In formula：Y is the gray value of image slices vegetarian refreshments, and t is threshold value, and g (x, y) is the gray value after binaryzation, f (x, y)
For the gray value before binaryzation, 220 threshold values by default are selected.
It is using advantageous effect caused by above-mentioned technical proposal：
1) present invention is with digital image processing techniques, the asphalt mixtures modified by epoxy resin to the different temperatures, humidity and the luminous intensity that collect
Fat dielectric ultraviolet imagery figure and infrared imaging figure are targetedly compared, and more can really and accurately react insulation cracking
Situation, so as to improve accuracy in detection.
2) present invention can either quantificational expression degree of discharge, and can be positioned by obtaining infrared image, so as to more
Whether the insulation of accurate judgement dry reactor cracks and insulation cracking position.
3) present invention can monitor dry reactor on-line, the dry reactor insulation cracking problem reflected,
It can reduce or even dry reactor is avoided to generate breakdown accident during operation, better preventive effect will be played.
4) present invention has testing efficiency height, highly reliable, is suitble to engineering detecting and scientific research, has higher application
Value.
Description of the drawings
Fig. 1 is the flow chart that the present invention establishes image threshold information database；
Fig. 2 is the flow chart of dry reactor epoxy resins insulation medium cracking detection of the present invention.
Ultraviolet detection principle
Dry reactor in the fabrication process, dielectric may contain small crack, hole the defects of or running
Middle generation insulation degradation, these all can increase insulating surface field strength, surface shelf depreciation luminous intensity be caused acutely to increase, by putting
Motor reason is understood, in the different phase of electric discharge, with the excitation of molecule, ionization, compound, charge-exchange, electron attachment and spoke
The continuous generation penetrated it is observed that the luminescence phenomenon of different spectrum, contains part ultraviolet light spectral coverage in corona discharge spectrum
It shines, the ultraviolet light sent can be captured by ultraviolet imager.Therefore, the ultraviolet light that detection electric discharge is sent, it can be determined that put
It is electric strong and weak, so that it is determined that the state of Electric Power Equipment Insulation medium.It, can be to the insulation of equipment using highly sensitive Ultraviolet sensor
Early prediction is made in decline, lacerated wound, filthy development etc., ensures the safe operation of equipment.The wave-length coverage of ultraviolet light for 10~
400nm.Also ultraviolet light is contained in sunlight, the solar radiation of wherein below 280nm spectrum segments is almost absorbed by atmosphere,
Thus it is referred to as solar blind.The ultraviolet light quantity emitted in the section by the sun is extremely low.EUV discharge under daylight, which detects, is
The detection to discharge equipment is realized using solar blind spectrum segment.
Infrared detection principle
After insulation degradation occurs for dry reactor epoxy resins insulation medium, the spread voltage to insulate in operation can be caused
Change, leakage current it is abnormal, occur generating heat or local send out sign cool.Using infrared detection technology, dielectric is carried out infrared
Thermal imaging is handled, and the heterogeneity phantom of dielectric is can obtain, corresponding to the voltage's distribiuting of dielectric.Since deterioration insulation can make
Into phenomena such as cracks Wen Sheng, internal penetrability leakage current and surface leakage current increase, fever increases, surface temperature compared with
Height according to compareing for insulating surface temperature and the sub- surface temperature of corresponding position normal insulation, can determine that epoxy resins insulation medium
State of insulation.
Infrared detection is exactly the infrared radiation signal by detecting object, obtains the Warm status feature of object, and according to this
Kind Warm status feature and corresponding basis for estimation judge the state of object.Due to infrared detection technology have it is remote, do not connect
The features such as tactile, real-time, quick, thus to realizing that the on-line monitoring and fault diagonosing of power equipment has great importance.Electric power
Equipment mainly measures two kinds of infrared detection technologies using infrared imaging and infrared point temperature.
Specific embodiment
A kind of dry reactor epoxy resins insulation medium cracking detection method, this method is online test method, bag
It includes and establishes image threshold information database and dry reactor epoxy resins insulation medium cracking two big steps of detection：
A, establish image threshold information database, image threshold information database include electric discharge image threshold data message and
The adquisitiones of temperature pattern threshold data information, electric discharge image threshold data message and temperature pattern threshold data information includes
Following steps：
A), by ultraviolet imager and infrared thermoviewer respectively under different humitures and luminous intensity to the asphalt mixtures modified by epoxy resin of cracking
Fat dielectric carries out Image Acquisition, obtains the ultraviolet image and infrared image under different humitures and luminous intensity；
B), to epoxy resins insulation medium cracking position pixel corresponding in the ultraviolet image and infrared image that are gathered
Extract, the pixel extracted in ultraviolet image be discharge threshold source data information, the picture extracted in infrared image
Element is temperature threshold source data information；
C), to the discharge threshold source data information and temperature threshold source data information that are gathered respectively by formula Y=
0.299R+0.587G+0.114B is converted into gray level image information；
In formula：Y is the gray value of image slices vegetarian refreshments, and R is red pixel component value, and G is green pixel component value, and B is
Blue pixel component value；
Y scopes are 0~255, and the gray value of complete white vegetarian refreshments is " 255 ", and the gray value of completely black pixel is " 0 "；
The gray level image information that discharge threshold source data information is converted into forms electric discharge image threshold data message, temperature threshold
The gray level image information that value source data information is converted into forms temperature pattern threshold data information；
B, dry reactor epoxy resins insulation medium cracking detection, comprises the following steps：
A), image information samples, in 23 DEG C of temperature, humidity 50%, intensity of illumination 4 × 104Under Lx detection environment, pass through purple
Outer imager and infrared thermoviewer carry out epoxy resins insulation medium to be detected the shooting of circumferential multi-angle respectively, adopt
Collect ultraviolet image data message and infrared picture data information；
B), to the ultraviolet image data message and infrared picture data information that are gathered respectively by formula Y=0.299R+
0.587G+0.114B is converted into greyscale image data information；
In formula：Y is the gray value of image slices vegetarian refreshments, and R is red pixel component value, and G is green pixel component value, and B is indigo plant
Colour component values；
The gray level image that ultraviolet image data message is converted into forms strength of discharge image information to be checked, infrared picture data
The gray level image that information is converted into forms heating intensity image information to be checked；To electric discharge image information by Threshold Segmentation Algorithm into
Row denoising assigns Y=255 or Y=0 to each pixel of electric discharge image information, and mathematical model is：
In formula：Y is the gray value of image slices vegetarian refreshments, and t is threshold value, and g (x, y) is the gray value after binaryzation, f (x, y)
For the gray value before binaryzation, 220 threshold values by default are selected.In view of the image of the region of discharge in ultraviolet image is whiter, and
The gray value of background image is generally significantly less than the value, found from the histogram of substantial amounts of test gray level image in gray value be
220 or so there are an apparent trough, thus selects 220 threshold values by default；
C), to the strength of discharge gathered image information to be checked humiture identical with image threshold database and luminous intensity
Corresponding electric discharge image threshold data message is compared, and is extracted in strength of discharge image information to be checked higher than electric discharge image
Threshold data message part shown profile in the picture, forms electric discharge image information, if strength of discharge image letter to be checked
Breath does not extract electric discharge image information, then judging result is the non-paradoxical discharge of dry reactor epoxy resins insulation medium；
D), the heating intensity image information to be checked humiture identical with image threshold database and luminous intensity to being gathered
Corresponding temperature pattern threshold data information is compared, and is extracted in heating intensity image information to be checked higher than temperature pattern
Threshold data message part shown profile in the picture, forms high temperature image information, if heating intensity image letter to be checked
High temperature image information is not extracted in breath, then judging result is the non-mid-winter of dry reactor epoxy resins insulation medium；
E), the detection of epoxy resin cracking judges, electric discharge image information and high temperature image information is compared, in image
In banding contour convergence part can be judged as dry reactor epoxy resins insulation medium crack location, if electric discharge image
Information and high temperature image information, which do not contrast contour convergence part, can be judged as dry reactor epoxy resins insulation medium not
Cracking.
Claims (3)
1. a kind of dry reactor epoxy resins insulation medium cracking detection method, it is characterised in that：The method is online inspection
Survey method, including establishing image threshold information database and the step greatly of dry reactor epoxy resins insulation medium cracking detection two
Suddenly：
A, establish image threshold information database, described image threshold information database include electric discharge image threshold data message and
The adquisitiones of temperature pattern threshold data information, the electric discharge image threshold data message and temperature pattern threshold data information
Comprise the following steps：
A), by ultraviolet imager and infrared thermoviewer respectively under different humitures and luminous intensity it is exhausted to the epoxy resin of cracking
Edge medium carries out Image Acquisition, obtains the ultraviolet image and infrared image under different humitures and luminous intensity；
B), epoxy resins insulation medium cracking position pixel corresponding in the ultraviolet image and infrared image that are gathered is carried out
Extraction, the pixel extracted in ultraviolet image are discharge threshold source data information, and the pixel extracted in infrared image is
Temperature threshold source data information；
C), to the discharge threshold source data information and the temperature threshold source data information that are gathered respectively by formula Y
=0.299R+0.587G+0.114B is converted into gray level image information；
In formula：Y is the gray value of image slices vegetarian refreshments, and R is red pixel component value, and G is green pixel component value, and B is blueness
Pixel component value；
Y scopes are 0~255, and the gray value of complete white vegetarian refreshments is " 255 ", and the gray value of completely black pixel is " 0 "；
The gray level image information that the discharge threshold source data information is converted into forms electric discharge image threshold data message, the temperature
The gray level image information that degree threshold value source data information is converted into forms temperature pattern threshold data information；
B, dry reactor epoxy resins insulation medium cracking detection, comprises the following steps：
A), image information samples, and epoxy resins insulation medium to be detected is distinguished by ultraviolet imager and infrared thermoviewer
The shooting of multi-angle is carried out, ultraviolet image data message and infrared picture data information is gathered, and records acquisition picture number simultaneously
It is believed that humiture and luminous intensity during breath；
B), to the ultraviolet image data message and the infrared picture data information that are gathered respectively by formula Y=
0.299R+0.587G+0.114B is converted into greyscale image data information；
In formula：Y is the gray value of image slices vegetarian refreshments, and R is red pixel component value, and G is green pixel component value, and B is blue picture
Component values；
The gray level image that the ultraviolet image data message is converted into forms strength of discharge image information to be checked, the infrared image
The gray level image that data message is converted into forms heating intensity image information to be checked；
C) it is, right to the strength of discharge gathered image information to be checked humiture identical with image threshold database and luminous intensity institute
The electric discharge image threshold data message answered is compared, and is extracted in strength of discharge image information to be checked higher than electric discharge image threshold
Data information portion shown profile in the picture, forms electric discharge image information, if strength of discharge image information to be checked is not
Electric discharge image information is extracted, then judging result is the non-paradoxical discharge of dry reactor epoxy resins insulation medium；
D) it is, right to heating intensity image information to be checked humiture identical with image threshold database and the luminous intensity institute gathered
The temperature pattern threshold data information answered is compared, and is extracted in heating intensity image information to be checked higher than temperature pattern threshold value
Data information portion shown profile in the picture, forms high temperature image information, if in heating intensity image information to be checked
High temperature image information is not extracted, then judging result is the non-mid-winter of dry reactor epoxy resins insulation medium；
E), the detection of epoxy resin cracking judges, the electric discharge image information and high temperature image information is compared, in image
In contour convergence part can be judged as dry reactor epoxy resins insulation medium crack location, if the electric discharge image
Information and high temperature image information, which do not contrast contour convergence part, can be judged as dry reactor epoxy resins insulation medium not
Cracking.
2. a kind of dry reactor epoxy resins insulation medium cracking detection method according to claim 1, feature exist
In：In stepb, multi-angle is carried out to epoxy resins insulation medium to be detected by ultraviolet imager and infrared thermoviewer
Shooting, to carry out circumferential multi-angled shooting to epoxy resins insulation medium to be detected.
3. a kind of dry reactor epoxy resins insulation medium cracking detection method according to claim 2, feature exist
In：In stepb, denoising is carried out by Threshold Segmentation Algorithm to the electric discharge image information, it is each to electric discharge image information
Pixel assigns Y=255 or Y=0, and mathematical model is：
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<mn>255</mn>
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In formula：Y is the gray value of image slices vegetarian refreshments, and t is threshold value, and g (x, y) is the gray value after binaryzation, and f (x, y) is two
Gray value before value selects 220 threshold values by default.
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| CN109648755A (en) * | 2018-12-19 | 2019-04-19 | 北京华强诚信电器有限公司 | A kind of mutual inductor baking molding control system and method |
| CN111145995A (en) * | 2019-12-10 | 2020-05-12 | 南昌顺景科技有限公司 | Voltage unit body structure of combined transformer |
| CN114062821A (en) * | 2021-11-17 | 2022-02-18 | 国网重庆市电力公司电力科学研究院 | Dry-type reactor fault analysis method based on electric power intelligent cruise robot |
| CN114166852A (en) * | 2021-12-06 | 2022-03-11 | 国网宁夏电力有限公司超高压公司 | Smoothing reactor on-line monitoring method and system based on multispectral detection |
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